Possible Clues:

• Support at top of tower
• At university, well-protected area gets maintenance
• Unionist to have a look around weekend for support
• Running costs continue, after switching components
• At university, withhold maintenance costs
• Cost of maintaining prince in posh part of castle
• Homeowner's concern
• Maintenance of university park with European record
• Maintenance that, if followed, produces secret look?
• A quick look over after heightened maintenance